2510 diesel wiring questions

Ray IN

Member
I am trying to fix some cobbled up wiring on a 2510 diesel. It has an alternator and negative ground. I know it would work either way, but is the light switch supposed to be fed from the key switch or should it get power directly from the battery? And the circuit breaker is only used to protect the lighting circuits, correct? I know, I need the manual so I can see the original diagram. One more thing--the sensing wire on the alternator was broken so could that be what was causing the circuit breaker to trip when the lights were on for a short period? Thanks!
 

IIRC the light switch is powered from the battery. I think broken alt exciter wire should trip a circuit breaker unless bare wire is contacting frame. You're correct in that circuit breakers on inside of dash panel are for light circuit.
 
Those circut breakers do go bad with age. Had the same problem with a 4020 and new breakers fixed it.You can bypass them and use an inline fuse as well.Tom
 
Yes Tom I think you are right because it appears there is a double switched hot wire coming off the key switch, with one wire going to the circuit breaker for lights an the other wire going to the push button starter. Previous owner had wired battery straight to the circuit breaker, and this was slowly draining battery through the fuel gauge and voltmeter (an add-on) which were then hot all the time even with the key off.
 

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